growmat.cpp

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#include "growmat.h"

CvGrowMat::CvGrowMat(int maxlines, int maxcols, int type)
{
        mat = cvCreateMat(maxlines, maxcols, type);
        cvSetZero(mat);
        cvGetSubRect(mat, this, cvRect(0,0,maxcols,maxlines));
}

CvGrowMat::~CvGrowMat()
{
        cvReleaseMat(&mat);
}

void CvGrowMat::resize(int lines, int cols)
{
        if (lines <= mat->rows && cols <= mat->cols) {
                cvGetSubRect(mat, this, cvRect(0,0,cols,lines));
                //this->rows = lines;
                //this->cols = cols;
        } else {
                int nl = (lines > mat->rows ? lines*2 : mat->rows);
                int nc = (cols > mat->cols ? cols*2 : mat->cols);
                CvMat *nm = cvCreateMat(nl, nc, mat->type);
                cvSetZero(nm);
                if (this->rows && this->cols) {
                        CvMat sub;
                        cvGetSubRect(nm, &sub, cvRect(0,0,this->cols, this->rows));
                        cvCopy(this, &sub);
                        cvGetSubRect(nm, this, cvRect(0,0,cols, lines));
                } else {
                        cvGetSubRect(nm, this, cvRect(0,0,mat->cols, mat->rows));
                        this->rows = lines;
                        this->cols = cols;
                }
                cvReleaseMat(&mat);
                mat = nm;
        }
}